Abstract:

In order to solve the problem of high capital and operating expenses in tunnel construction in the western region, the methods of data investigation, quantitative analysis and experience summary are adopted. By analyzing the condition and environment of tunnel construction, the gravel soil problems such as stability of slope, the difficulty to access the tunnel portal and roof surface settlement are solved. Based on the principle of safety and economic line selection, the schemes for different tunnel lengths are comprehensively demonstrated. The construction technologies such as scheme of anti-slide pile design, advanced long pipe roof and surface grouting reinforcement are proposed to eliminate the impact of poor geology on tunnel safety. In a reliable and economical way, that is poor geological treatment for tunnel length replacement, the financial pressures on transportation construction and tunnel operation are relieved.

Key words: tunnel route setting, tunnel length, slope stability, gravel soil slope